add home button

ImageViewer/ViewController.swift

@@ -74,6 +74,8 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
     let backgroundColorDropdownView = UIView()
     let backgroundColorDropdownButton = UIButton()
 
+    let homeButton = UIButton()
+
     let fileManager = FileManager.default
     var globalState = getGlobalState()
 
@@ -110,13 +112,12 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         setupImageView()
         setupGestures()
         setupTopBar()
+        setupHomeView()
         if let name = globalState.comicName {
-            saveGlobalState()
             readComic(name: name)
         } else {
             readerView.isHidden = true
             homeView.isHidden = false
-            setupHomeView()
         }
     }
 
@@ -296,6 +297,35 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
 
         setupBackgroundColorDropdown()
         setupPageTurnDropdown()
+        setupHomeButton()
+    }
+
+    func setupHomeButton() {
+        homeButton.setTitle("Home", for: .normal)
+        homeButton.setTitleColor(.white, for: .normal)
+        homeButton.isHidden = true
+        homeButton.translatesAutoresizingMaskIntoConstraints = false
+        topBarView.addSubview(homeButton)
+
+        homeButton.addTarget(
+            self, action: #selector(goHome), for: .touchDown
+        )
+        NSLayoutConstraint.activate([
+            homeButton.trailingAnchor.constraint(
+                equalTo: topBarView.trailingAnchor, constant: -32
+            ),
+            homeButton.centerYAnchor.constraint(
+                equalTo: topBarView.centerYAnchor),
+            homeButton.topAnchor.constraint(
+                equalTo: topBarView.topAnchor),
+            homeButton.bottomAnchor.constraint(
+                equalTo: topBarView.bottomAnchor),
+        ])
+    }
+
+    @objc func goHome() {
+        readerView.isHidden = true
+        homeView.isHidden = false
     }
 
     func setupBackgroundColorDropdown() {
@@ -483,6 +513,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
 
         pageTurnDropdownButton.isHidden = topBarView.isHidden
         backgroundColorDropdownButton.isHidden = topBarView.isHidden
+        homeButton.isHidden = topBarView.isHidden
 
         if topBarView.isHidden {
             pageTurnDropdownView.isHidden = true